Linux & DMA transfer (applied to 8245)

Hi ,
I am implementing DMA transfers initiated by the processor for the MPC8245. Since the standard pci_alloc_consistent take only a pci_dev structure but no addresses, I added a configuration function to set the target address (PCI) and the other parameters.
I can see that the DMA transfer is started, and finished (an interrupt is generated) but I don't see the data copied on the target device ( DSP with a 4 MB memory window on PCI bus.)
My question is : What type of addreess must I give to configure the DMA controller.
Are there also caching issues that may prevent good read/write operation s? I suppose that the flushing og the cache done in pci_alloc_consistent is enough.
Thanks
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Benoit Callebaut
Software Development Engineer
Barco | Control Rooms
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